Waterproofing composition and method of producing the same



Patented Nov. 8, 1927..

UNITED STATES PATENT. OFFICE.

THOMAS A. O'BARB, OF WEBB CITY MISSOURI, ASSIGNOR, BY MESNE ASSIGNMENTS,TO E. I. DU PONT DE NEMOUBS & COMPANY, OF WILMINGTON, DELAWARE, A COR-PORATION OF DELAWARE.

WATERPROOFING COMPOSITION AND METHOD OF PRODUCING THE SAME.

No Drawing.

The invention. is concerned with-a waterroofing composition which, whileapplicale to many kinds of materials, IlS PB-IHCH- larly applicable toingredients for explosives.

Oneimportantobject of the invention is to provide A an inexpensivewaterproofing composition which, when appli'ed to the material,willspread over all surface irregularities in a thin protective film whichis impervious to moisture but will neither harden nor de-sensitizethe'material to an injurious extent.

Another important object is to provide a method of producing thewaterproofing composition, whereby to develop in the composition thoseproperties which best adapt the same for association with any particularmaterial.

Another object is to provide a method of applying the waterproofingcomposition to the material, whereby to insure proper association withthe same.

Other objects and advantages not specifically referred to in thedisclosure wlll'be appreciated upon a full comprehension of the natureof thewaterproofing composition as hereinafter described.

The Waterproofing com osition contains a vegetable drying 011, suc astung oil, linseed oil, or poppyseed oil; a gum or resin, such ascolophony; and one or more mixtures of members of the araflin series,such mixtures being exempli ed by petrolatum and paraffin.

The relative proportions in which the above named constituents occur inthe waterproofing composition are subject to variation, since theproportions influence the properties develo d in the composition, and itmay be desirable in specific instances of proposed application to eitheraccentuate or minimize certain of such properties.

The following mixture of the constituents, which is of course but oneexemplifying embodiment of the invention, will produce a batch of thewaterproofing composition which is particularly a plicable tomgre'dients' for explosives an is in such applica- Application med Marcha, 1924. Serial No. 697,705.

tion quite superior to other compositions heretofore employed for thesame purpose: Tu l Per cent. 1 ng o1 about 2 'Colophony 5 Petrolatumi 13Paraffin 80 The method of producing the waterproofmg composition fromthe above mentioned constituents is preferably performed by melting thecolophony, heating the tung oil, adding the melted colophony to theheated tungoil, and heating the colophony-tung Oll mixture until a testportion of the mixture will not affect the stability of ammonium nitratewhen added to the same; then heatmg and mlxing together the petrolatumand the paraifin; and then adding the colophon tung 011 mixture to thepetrolatum-parafli n mlxture and agitating the resulting mixture until ahomogeneous composition is obtalned. This method insures uniformproduction of the desired composition, and overcomes in a simple mannerthe difliculty which is usually experienced in attempting to render intohomogeneous composition constituents which are in such unequalquantities and are of such dissimilar physical characteristics.

The method of applying the waterproofmg composition to a'material, forinstance ammonium nitrate, is preferably performed by applying thecomposition in melted c0ndition to the ammonium nitrate when the lat teris at a temperature above the melting point of the composition. Thismethod results in a uniformly spread coating of the composition over allsurface irregularities of the material.

It is intended, of course, that where specific substances are recited inthe following claims that such claims be construed to cover substancesof the same general class which can be substituted for the substancesnamed without invention. By the term resin as employed in the claims,for instance, I intend to designate not only those oxygenated bodiesgenerally produced by the oxidation of terpenes and related hydrocarbonsin plants and technically classified as resins, but as well thoseexudations from plants known-as gums and gum resins and substances of asimilar nature.

I claim: a

1. The method of applying to ammonium nitrate a waterproofingcomposition containing tung oil, colophony, petrolatum and paraflin,which comprises applying the composition in melted condition to theammonium nitrate when the latter is at a temperature above the meltingpoint of the composition.

2. An ingredient for explosives comprising ammonium nitrate, theparticles of which are uniformly coated with a layer of waterproofingmaterial consisting of a homogeneous mixture of tung-oil, a resin andmembers of the paraflin series.

3. An ingredient for explosives uniformly coated with a layer ofwaterproofing material comprising a homogeneous mixture of a vegetabledrying oil, a resin and members of the paraflin series.

4.? A method of waterproofing ammonium nitrate, which comprises meltingresin and mixin it, whilemelted, with a heated vegetable rying oil untila test portion of the mixture will not affect the stability of a testportion of ammonium nitrate, mixing the drying oil-resin liquid with aheated mixture of hydro-carbons of the parafiin series, ,heating theammonium nitrate to a temperature above the melting point of thecomposition and applying the composition while in melted form to theheated nitrate.

In testimony whereof I have hereunto signed my name.

THOMAS A. OBARR.

